Craftsman 320.27669 Operator's Manual download pdf (Page 26)

EDGING WiTH A PILOT BIT (Figs. 19 and 19a

The arbor-type bits with pilots are excellent

for edge shaping of any workpiece edge that

is straight, or is curved at a curvature as great

or greater than the radius of the bit to be

used. The pilot prevents the bit from making

an excessively deep cut, and holding the pilot

firmly in contact with the workpiece edge

throughout prevents the cut from becoming

too shallow.

Fig. 19

Motor Housing

Pilot Fixed Base Work-

sub-base piece

TOP EDGE SHAPING

Whenever the workpiece thickness, together

with the desired depth of cut (as adjusted by

router depth setting) are such that only the

top part of the edge is to be shaped (leaving

at least a 1/16 inch. thick uncut portion at the Fig. 19a

bottom), the pilot can ride against the uncut

portion, which serves to guide it (Fig. 19).

If the workpiece is too thin or if the bit is

set so low that there will be no uncut edge

against which to ride the pilot, an extra

board must be placed under the workpiece

to act as a guide (Fig. 19a). This "guide"

board must have exactly the same contour - Guide Board

straight or curved - as the workpiece edge.

If it is positioned so that its edge is flush WHOLE EDGE SHAPING

with the workpiece edge, the bit will make a full cut (in as far as the bit radius).

On the other hand, if the guide is positioned as shown in Fig. 19a (out from the

workpiece edge), the bit will make less than a full cut - which will alter the shape

of the finished edge.

NOTE: The size (diameter) of the pilot that is used determines the maximum cut

width that can be made with the pilot against the workpiece edge (the small pilot

exposes all of the bit; the large one reduces this amount by 1/16 inch). Any of

the piloted cutter bits can be used without a pilot for edge shaping with guides.

WARNING: Always securely clamp your workpiece and keep a firm grip on

the router base with both hands at all times. Failure to do so could result in loss

of control causing possible serious personal injury.

27669 ManuaLRevised_11 0215 Page 26

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Craftsman 320.27669 Operator's Manual Page 26